| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.mapreduce.lib.join; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.io.WritableComparator; |
| |
| /** |
| * Full outer join. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class OuterJoinRecordReader<K extends WritableComparable<?>> |
| extends JoinRecordReader<K> { |
| |
| OuterJoinRecordReader(int id, Configuration conf, int capacity, |
| Class<? extends WritableComparator> cmpcl) throws IOException { |
| super(id, conf, capacity, cmpcl); |
| } |
| |
| /** |
| * Emit everything from the collector. |
| */ |
| protected boolean combine(Object[] srcs, TupleWritable dst) { |
| assert srcs.length == dst.size(); |
| return true; |
| } |
| } |